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Rengi Forge Audio Loop Creator
x402
Rengi Forge Audio Loop Creator is a paid API for AI agents from rengi.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-22).
Converts a music track or ambient audio into a seamless loop by cutting at zero crossings and applying an equal-power crossfade from the end back into the start, returning the looped file, a 3x preview, and loop point positions in samples.
Price / call$0.1
Success—
StatusUnknown
How this service works
Audio tools: Turn music or ambience into a seamless loop: cuts at zero crossings and crossfades the end into the start with an equal-power curve. Returns the loop, a 3x preview and loop points in samples. Full schema: https://rengi.dev/v1/audio-tools/schema
Output
Returns the processed looped audio file in the requested format (ogg, wav, or mp3), a 3x-length preview file demonstrating the loop transition, and the loop start and end points expressed in samples so they can be embedded in an audio engine or DAW.
Example use cases
Game background music loop
“I have this forest ambience track at https://cdn.mygame.com/forest.wav — can you make it loop seamlessly from the 1-second mark to the 58-second mark with a 150ms crossfade? Give me the result as an ogg file.”
Web app ambient loop
“Turn this café background audio at https://assets.myapp.com/cafe.mp3 into a seamless loop using a 120ms crossfade — I need it as an mp3 I can use as a continuously playing background on my website.”
Looping sound effect for UI
“I've got a base64-encoded wav of a soft hum sound — make it into a seamless stereo loop with a short 50ms crossfade and return it as a wav file with the loop point positions so I can set them in my audio engine.”
Technical details
Endpoint
POSThttps://rengi.dev/v1/audio-tools/loop?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a technically clean, click-free looping audio file — especially for game background music, ambient web audio, or any scenario where the loop must repeat indefinitely without an audible seam. It is specifically designed for zero-crossing cuts and equal-power crossfades, which is superior to naive sample-level cuts. Prefer it over generic audio editors when you need automated loop-point detection and a ready-to-use preview in a single API call.
Side effects
- Audio file cannot be decoded (unsupported codec or corrupt data) — returns an error with format details
- crossfadeMs value exceeds the duration of the selected loop region — returns a validation error
- Neither audio nor audioUrl provided — returns a missing-input error
- Audio URL is unreachable or returns a non-audio response — returns a fetch error
- Audio is too short for the requested start/end window — returns an out-of-bounds error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| mono | boolean | |
| audio | string | Audio file as base64 (wav, mp3, ogg, flac, m4a). |
| endSec | number | |
| format | string | |
| audioUrl | string | Audio file URL. |
| startSec | number | |
| crossfadeMs | number |
Tags
x402
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